One or more door lock assembly may fail and cause door locking/unlocking problems.Google+
Car Problem Reports
Volvo S70 Door Lock Assemblies May Fail and Cause Locking/Unlocking Problems
Volvo S70 Problem
Average Mileage: 151,778 mi (95,000 mi - 225,000 mi)
Visitor, 1999 Volvo S70, 95,000 mi
passenger door latch does not open from inside have to roll down window to open door from handle outside. Sometimes electronic window will not roll down with passenger control and driver side has to do it.
It is not fixed.
Visitor, 1998 Volvo S70, 160,000 mi
passenger front door lock does not work manually or remotely.
door cannot be locked.
after research it's the door latch assembly which is a mechanical and electrical device that locks the door.
a torx 20 and torx 25 screw driver along with a couple flat head screw drivers will help you replace it with a new one ($150) within the hour.
Visitor, 1998 Volvo S70, 194,000 mi
key no longer operates door locks, tho' it turns, so the lock cylinder is not frozen
Visitor, 1999 Volvo S70, 198,050 mi
driver side door will not open, had to take door panel off inside and probably cut the door panel to get to the striker for the door lock and chisel off
I CANNOT GET THE FRONT PASSENGER DOOR TO LOCK, IT MOVES WHEN I HIT THE REMOTE LOCK SWITCH BUT WILL NOT LOCK.
Visitor, 2000 Volvo S70, 225,000 mi
Sometimes only the driver's side unlocks with the remote, other times maybe two other doors open along with the driver's side door but rarely if ever does the remote unlock all four doors. Inside the vehicle when pressing the central locking system all door latches tend to stay in the downward position. It is a case of hit or miss as to when and which door will unlock from inside or outside the vehicle.
Visitor, 2000 Volvo S70, 118,000 mi
driver door locked and won't unlock.
Visitor, 1999 Volvo S70, 143,000 mi
Visitor, 1998 Volvo S70, 214,000 mi
key will not lock doors or unlock
Visitor, 1998 Volvo S70, 116,852 mi
Electric Door locks will unlock but will not lock. Told all four door acuators are worn out. Cost $259 per door to fix.